Comparison Between Internal Points, Database Variables and Parameters

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ClearSCADA contains a number of objects which can be used to store a value, the following table documents the differences between them to help decide which object type should be used


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Property	Internal Point	Database Variable	Parameter	Comment
Database icon	Dark Grey	Yellow	Light Grey
Which data steam are the values stored within?	Data stream	Data stream	Config stream	The choice of which steam is important should you export/import the object via SDE. SDE files only contain the config stream so on import the internal point and database variable will have no value
Permission required to change value	Control	Control	Configure	Generally operators will have the Control permissions but not Configure, this can be used to control who can change the value
Alarms	Analogue and digital: Yes String and Time: No	No	No
Historic	Analogue and digital: Yes String and Time: No	No	No
Value change logging	Standard event logging	Standard event logging	Config Changes table, if enabled
Includes in count for licensing?	Yes	No	No
Included data types	Analogue digital string time	Lots, including (array for some): Boolean, byte colour (RGB) double floats strings time variants	Postal address double grid reference object link parameter table string
Triggers logic on-input changed	Analogue and digital: Yes String and Time: No	No	No